Maine and New Hampshire data - USF&W National Wetland Inventory Maps downloaded from http://www.fws.gov/wetlands/data/Data-Download.html Canadian data - Canadian Wildlife Service Wetland Inventory Maps downloaded from http://maps.ducks.ca/cwi/ and http://www.geobase.ca/geobase/en/data/landcover/csc2000v/description.html

Hodgkins (1999)

W

LC11IMP

Percentage of area covered by impervious surfaces, from NLCD 2011

area-weighted mean

NLCD 2011 imperviousness grid http://www.mrlc.gov/nlcd01_data.php

LC11DEV

Percentage of area covered by Urban land use, from NLCD 2011

percent of area

NLCD 2011, codes 21-24 http://www.mrlc.gov/nlcd01_data.php

The Maine StreamStats introductory page here has additional information regarding the application, including links to reports, cooperators, and other explanatory information.